使用情况&＃xff1a;
在activity中&＃xff0c;出现了popupwindow和dialog&＃xff0c;这个时候&＃xff0c;如果点击返回键&＃xff0c;它们消失了&＃xff0c;但是一些操作还在继续。如&＃xff1a;1、进行耗时操作&＃xff0c;出现dialog提醒用户等待&＃xff0c;这时&＃xff0c;按下返回键&＃xff0c;dialog消失&＃xff0c;但是&＃xff0c;耗时操作还在继续。这是因为&＃xff0c;dialog拦截了返回键&＃xff0c;消费了它&＃xff0c;让自己消失&＃xff0c;但是其他进程还在继续。2、一个activity&＃xff08;A&＃xff09;&＃xff0c;start了新activity&＃xff08;B&＃xff09;&＃xff0c;B要展示一个popupwindow&＃xff0c;这时&＃xff0c;按下返回键&＃xff0c;popupwindow消失了&＃xff0c;但是B还在。我要的效果是&＃xff1a;按下返回键&＃xff0c;popupwindow消失&＃xff0c;B做finish
代码讲解&＃xff1a;
1、popupwindow
需要导包
import android.view.View.OnKeyListener;
View popupWindowView &＃61; LayoutInflater.from(context).inflate(R.layout.select_layout, null);popupWindow &＃61; new PopupWindow(popupWindowView, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);popupWindow.setAnimationStyle(R.style.SelectAnimationShow);// 菜单背景色ColorDrawable dw &＃61; new ColorDrawable(0x00ffffff);popupWindow.setBackgroundDrawable(dw);popupWindow.showAtLocation(LayoutInflater.from(context).inflate(R.layout.select_activity_layout, null),Gravity.TOP | Gravity.CENTER_HORIZONTAL, 0, 0);popupWindow.setFocusable(true);popupWindowView.setFocusable(true);popupWindowView.setFocusableInTouchMode(true);popupWindowView.setOnKeyListener(new OnKeyListener() {&＃64;Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {//do something...return true;}});
**注&＃xff1a;**PopupWindow的构造函数&＃xff0c;一定&＃xff0c;一定要用上面写的那种&＃xff0c;其他的&＃xff0c;没效果或者出错。原因不清楚。
这样写了以后&＃xff0c;出现popupwindow时&＃xff0c;点击返回键&＃xff0c;popupwindow消失&＃xff0c;activity-B也会走到onDestroy()这个生命周期
2、dialog
DialogInterface.OnKeyListener keylistener &＃61; new DialogInterface.OnKeyListener(){public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {if (keyCode&＃61;&＃61;KeyEvent.KEYCODE_BACK&&event.getRepeatCount()&＃61;&＃61;0){//do something...return false;}else{return true;}}} ;
最后
mWaitingDialog.setOnKeyListener(keylistener);
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